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Micropower Thermocouple Signal Conditioner with Cold Junction Compensation

Micropower Thermocouple Signal Conditioner with Cold Junction Compensation

A thermistor, shown as R3, is used to monitor the cold junction temperature. Its resistance becomes smaller as the cold junction temperature increases. An increase in cold junction temperature will reduce the output voltage of the Type J thermocouple by 52uV/C. The voltage reference and scaling of resistor values creates an increasing 52uV/C voltage change at the amplifier + input as the thermistor resistance value changes.